Getting a 2-stroke to run cleaner?

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zuren
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Getting a 2-stroke to run cleaner?

Post by zuren »

I'm not a hippy-treehugger, but running my newish-to-me motor in a tank at home (50 gal. trash barrel) was a little eye opening on just how dirty a 2-stroke motor can be.  I understand that running a 2-stroke at idle is not running it at peak efficiency, but the oily scum that ended up floating in the top of that barrel was stomach turning.  Plugs are new, gas is ethanol-free from Mobil, oil is Quicksilver mixed at the correct ratio.  This engine does smoke some when it is running.  Should I suspect something isn't running right, or is this to be expected from a 1986 Mercury 2-stroke running at idle? 

Other than replacing the motor with a 4-stroke, I'm researching other ways to help a 2-stroke outboard run cleaner.  I know there is a lot of debate over oil, but I would be interested in knowing if others are running something different (at different ratios) and what their experiences have been with smoking and any kind of discharge in the exhaust?

Thanks!
1974 14' Smokercraft w/ 1986 Mercury 9.9HP 2-stroke
Project: Old Mirro for the pond
Location: SE Michigan

CedarRiverScooter
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Getting a 2-stroke to run cleaner?

Post by CedarRiverScooter »

Same result here. Oil scum in barrel. Lots of smoke when cold. Maybe you can run it on muffs at home long enough to warm it & then it would burn cleaner at the lake.

I don't think synthetic oil is any better. Maybe olive oil would be better for the ducks but not so good for your motor . . .

GYPSY400
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Getting a 2-stroke to run cleaner?

Post by GYPSY400 »

It is the nature of the beast. 2 things you can try:
Replace the thermostat and tune the carburetor appropriately, so it can run as lean as possible.. if its running cold all the time it wont burn fuel efficiently.
Run 100:1 mix when trolling with good synthetic oil. This topic will stir up some debate but I feel that the oils nowadays can sufficiently lube at 100:1.. you can run a second fuel tank that you use during trolling, and then switch back to your main 50:1 for high speed runs..

Weldorthemagnificent
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Re: Getting a 2-stroke to run cleaner?

Post by Weldorthemagnificent »

I can't imagine there's a guy out there who hasn't had a twinge of guilt after running an outboard in a barrel.

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MrGiggles
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Getting a 2-stroke to run cleaner?

Post by MrGiggles »

If that motor has been sitting, it'll be worse than usual.

When it's warmed up and has been run hard, you should not get any smoke, or very little under normal operating conditions (not trolling). Some smoke on startup or during extended idle is normal.

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Pappy
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Getting a 2-stroke to run cleaner?

Post by Pappy »

First off welcome to the forum.
Secondly, there has already been some good information coming your way.
Your engine has to run up to the thermostat temperature at idle. Usually around 135F or so on most engines. If not the engine will not burn the incoming fuel/oil mix as efficiently as it is capable of.
Third, a proper mixture has to be established. A rich mixture at idle will leave more unburned fuel on the water and in your mid-section on the engine.
Now.....Oils.
BRP has an oil that is an environmentally friendly oil. XD-100. It is one of the best oils out there as far as protection goes and it breaks down, leaving it about as good as it gets for the environment.
Always go with the fuel oil mixture rate the engine manufacturer list or even a little richer if you run weeds or shallow water to protect the powerhead in the event of an overheat. Some oil manufacturers will claim you can run at a leaner mixture with their oil. When everything is perfect that may hold some water but if you are running a touch lean, hotter than normal, etc. then all bets are off. Get the picture?

Shaugh
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Getting a 2-stroke to run cleaner?

Post by Shaugh »

My understanding is that any modern TC-3 outboard oil is designed to quickly break down. It's not as bad as it looks.... That's why it's white when it comes out.. it's already been emulsified or made to mix with water and break down.

zuren
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Getting a 2-stroke to run cleaner?

Post by zuren »

Weldorthemagnificent wrote:
05 Apr 2020, 09:03
I can't imagine there's a guy out there who hasn't had a twinge of guilt after running an outboard in a barrel.
Glad to know I'm in good company.
Pappy wrote:
05 Apr 2020, 10:32
First off welcome to the forum.

Secondly, there has already been some good information coming your way.
Your engine has to run up to the thermostat temperature at idle. Usually around 135F or so on most engines. If not the engine will not burn the incoming fuel/oil mix as efficiently as it is capable of.
Third, a proper mixture has to be established. A rich mixture at idle will leave more unburned fuel on the water and in your mid-section on the engine.
Now.....Oils.
BRP has an oil that is an environmentally friendly oil. XD-100. It is one of the best oils out there as far as protection goes and it breaks down, leaving it about as good as it gets for the environment.
Always go with the fuel oil mixture rate the engine manufacturer list or even a little richer if you run weeds or shallow water to protect the powerhead in the event of an overheat. Some oil manufacturers will claim you can run at a leaner mixture with their oil. When everything is perfect that may hold some water but if you are running a touch lean, hotter than normal, etc. then all bets are off. Get the picture?
Thanks Pappy! Thanks for the welcome, and this is the exact type of info I'm looking for. Regarding XD-100 being more environmentally friendly, I see some of the physical attributes mentioned in many places (smokeless, ashless, etc.) but it is usually a 1-liner in a marketing piece. Is there a place that I can find more detail on the XD-100 oil? I've poked around the Evinrude, BRP, and XPS Lubricants websites, and see nothing mentioned. Except for the fact that this oil is sold everywhere, it is almost as if it doesn't exist (no formal product website).

Thanks!
1974 14' Smokercraft w/ 1986 Mercury 9.9HP 2-stroke
Project: Old Mirro for the pond
Location: SE Michigan

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JL8Jeff
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Getting a 2-stroke to run cleaner?

Post by JL8Jeff »

Idle will always give you more smoke as will a restart. Depending on your situation and how you run your boat, you can run 100:1 mix which will help cut down on the smoke, but if you need to use full throttle often, I wouldn't recommend it. I run my boat upstream around 1/2 to 2/3 throttle (it's the smooth spot and quietest rpm range) and I've been running synthetic at 100:1 in two different boats/motors for the last 12-15 years with no problems. I've been running premix for a long time as the vro pumps always seem to crap out. I'm never in a hurry and our max range between wing dams is around 3 miles so just don't need WOT and I hate the extra noise especially out of a jet. I've used the Amsoil synthetic and now the Quicksilver synthetic.
Last edited by JL8Jeff on 06 Apr 2020, 10:10, edited 1 time in total.
2001 Lowe Roughneck 1652 VT with Merc 60/45 jet 2 stroke

Weldorthemagnificent
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Re: Getting a 2-stroke to run cleaner?

Post by Weldorthemagnificent »

There is a SDS available online as a pdf. Says it's not readily biodegradable and an environmental hazard. That being said, everything I read about it, it seems to be cleaner and less smoke and ash. I'm thinking it's worth a try.

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zuren
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Getting a 2-stroke to run cleaner?

Post by zuren »

Shaugh wrote:
06 Apr 2020, 09:35
My understanding is that any modern TC-3 outboard oil is designed to quickly break down. It's not as bad as it looks.... That's why it's white when it comes out.. it's already been emulsified or made to mix with water and break down.
This would definitely make me feel better if it is true. I just did a search, and a few articles I find on TCW-3 oils and the environment is this:

http://www.nmma.org/certification/oil/tc-w3 (I have some reading to do! "Satisfying EPA requirements" is mentioned on the front page, but I would like to know more).

https://www.practical-sailor.com/blog/t ... e-products (TCW-3 oil that touts its environmental friendliness; can this logic be applied to any oil carrying a TCW-3 certification?)

Thanks!
1974 14' Smokercraft w/ 1986 Mercury 9.9HP 2-stroke
Project: Old Mirro for the pond
Location: SE Michigan

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DaleH
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Getting a 2-stroke to run cleaner?

Post by DaleH »

I 2nd a well tuned/maintained engine and running XD-100 oil.

jeff925
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Getting a 2-stroke to run cleaner?

Post by jeff925 »

add 2 strokes :D

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DaleH
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Getting a 2-stroke to run cleaner?

Post by DaleH »

jeff925 wrote:
06 Apr 2020, 21:31
add 2 strokes :D
Nope, false ... 'fake news', haha :wink: ... as in the bigger motors (and probably holds true for smaller blocks too), the Evinrude E-Tec and newer G2s et al are CLEANER than 4-stroke OBs! To be as clean, 4-stroke OBs would need to add catalytic converter, as you're only thinking about the oil in the water and not factoring in the exhaust emissions.

Weldorthemagnificent
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Re: Getting a 2-stroke to run cleaner?

Post by Weldorthemagnificent »

From what I understand, decarbonizing an older outboard can help rings seal up better and make it run better. I'm far from an expert, just a tinkerer but I'm going to try this on the 9.5 evinrude I picked up last fall . Then a good quality oil like xd100 might be worth the extra coin to keep it running clean.

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